Description of problem:
I have an nvidia quadro which allows running multiple heads off of one card. 
The card detection in the multihead tab shows no second card.  Therefore on exit
of s-c-d it prints:

Traceback (most recent call last):
  File "/usr/share/system-config-display/xConfigDialog.py", line 200, in ok
    if card.getCardData()["NAME"] ==
self.secondVideocardOptionMenu.get_menu().get_active().get_data("NAME"):
AttributeError: 'NoneType' object has no attribute 'get_data'


Version-Release number of selected component (if applicable):
system-config-display-1.0.24-1

How reproducible:
always

Steps to Reproduce:
1.get card with support for more than one head
2.run s-c-d
3.
  
Actual results:
error above

Expected results:
nice, usable config file

Additional info:
The card in question is

01:00.0 VGA compatible controller: nVidia Corporation NV37GL [Quadro FX 330]
(rev a2)